using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Markup;
using System.Windows.Threading;
using FWindSoft.Data;

namespace FWindSoft.Wpf.Controls
{
    /// <summary>
    /// 导航窗体
    /// </summary>
    [ContentProperty("Content")]
    public class NChildWindow:UserControl
    {
        public static readonly DependencyProperty TitleProperty = DependencyProperty.Register("Title",
            typeof(string),
            typeof(NChildWindow), new PropertyMetadata(string.Empty));
        public static readonly DependencyProperty AttachElementProperty = DependencyProperty.Register("AttachElement",
            typeof(UIElement),
            typeof(NChildWindow), new PropertyMetadata(null));
        public NChildWindow()
        {
            BindingWidth();
            this.Loaded+=NChildWindow_Loaded;
            this.Unloaded+=NChildWindow_Unloaded;
            //AttachElements = new ObservableCollection<UIElement>();
        }
        #region 事件封装
        private static void NChildWindow_Unloaded(object sender, RoutedEventArgs e)
        {
            NChildWindow nW = sender as NChildWindow;
            if (nW == null)
                return;
            nW.OnClose(new NChildWindowArgs(e) { RefParameter = NavigationBar.GetParameter(nW) });
        }

        private static void NChildWindow_Loaded(object sender, RoutedEventArgs e)
        {
            NChildWindow nW = sender as NChildWindow;
            if (nW == null)
                return;
            nW.OnLoad(new NChildWindowArgs(e) { RefParameter = NavigationBar.GetParameter(nW) });
        } 
        #endregion
        protected virtual void OnLoad(NChildWindowArgs args )
        {
            if (EveryTimeLoad || !m_IsLoadData)
            {
                if (OnceBreakLoad.Value)
                {
                    return;
                }
                this.Dispatcher.BeginInvoke(DispatcherPriority.Loaded, new Action(() => {
                    if (args.RefParameter != null)
                    {
                        LoadData(args.RefParameter.StartParameter);
                    }
                    else
                    {
                        LoadData(null);
                    }

                    m_IsLoadData = true;
                }));
               
            }
        }
        protected virtual void OnClose(NChildWindowArgs args)
        {
        }

        /// <summary>
        /// 窗口名称
        /// </summary>
        public string Title
        {
            get { return this.GetValue(TitleProperty) as string; }
            set { this.SetValue(TitleProperty,value); }
        }

        #region 打开窗体
        public virtual void Show()
        {
            if (NavigationBar.CurrentNavigation != null)
            {
                NavigationBar.CurrentNavigation.Add(this);
            }
        }
        public virtual void Show(NavigationBar bar)
        {
            if (bar != null)
            {
                bar.Add(this);
            }
        }
        public virtual void Show(UIElement parent)
        {
            var bar = parent.GetParentType<NavigationBar>();
            if (bar != null)
            {
                bar.Add(this);
            }
        }
        public void Show(NParameter parameter)
        {
            NavigationBar.SetParameter(this, parameter);
            Show();
        }

        #endregion

        #region 加载信息模块
        private bool m_IsLoadData = false;
        public void ResetLoadData()
        {
            this.m_IsLoadData = false;
        }
        /// <summary>
        /// 每次都加载
        /// </summary>
        public bool EveryTimeLoad { get; protected set; }

        /// <summary>
        /// 是否打断一次加载【首次加载也可打断】
        /// </summary>
        public MomentVariable<bool> OnceBreakLoad { get; private set; } = new MomentVariable<bool>(false);
        protected virtual void LoadData(LoadParameter parameter)
        {
        }
        #endregion

        public void SetStartParameter(NParameter parameter)
        {
            NavigationBar.SetParameter(this, parameter);
        }

        public virtual void Close()
        {
            if (NavigationBar.CurrentNavigation != null)
            {
                NavigationBar.CurrentNavigation.Remove(this);
            }
        }

        public  void Close(NParameter parameter)
        {
            NavigationBar.SetParameter(this, parameter);
            Close();
        }
        
        /// <summary>
        /// 附加元素
        /// </summary>
        public UIElement AttachElement
        {
            get { return this.GetValue(AttachElementProperty) as UIElement; }
            set { this.SetValue(AttachElementProperty, value); }
        }

        #region 附加功能

        private void BindingWidth()
        {
            RelativeSource rs = new RelativeSource(RelativeSourceMode.FindAncestor);
            rs.AncestorType = typeof(ScrollContentPresenter);
            Binding binding = new Binding("ActualWidth") { RelativeSource = rs };
            this.SetBinding(WidthProperty, binding);
        }
        #endregion
    }

    public class NChildWindowArgs : RoutedEventArgs
    {
        public NChildWindowArgs(RoutedEventArgs args)
        {
            this.RoutedEvent = args.RoutedEvent;//他的顺序要在handled赋值之上
            this.Source = args.Source;
            this.Handled = args.Handled;
         
           
        }
        /// <summary>
        /// 关联参数
        /// </summary>
        public NParameter RefParameter { get; set; }
    }
}